What requirement did Southern states use to prevent citizens from voting unless their ancestors had been able to vote prior to Reconstruction in 1867?

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Literacy tests.

The requirement that Southern states used to prevent citizens from voting unless their ancestors had been able to vote prior to Reconstruction in 1867 was the use of literacy tests and poll taxes.

The requirement that Southern states used to prevent citizens from voting unless their ancestors had been able to vote prior to Reconstruction in 1867 is called the "grandfather clause".

To arrive at this answer, one can analyze the historical context of voter suppression in the Southern states during the post-Reconstruction era. After the Civil War, the Reconstruction period (1865-1877) aimed to rebuild the South and grant civil rights to newly freed African Americans. However, once Reconstruction ended, Southern states began implementing tactics to disenfranchise Black voters and maintain white supremacy.

One major method used was the introduction of literacy tests, poll taxes, and property ownership requirements. These measures disproportionately targeted African Americans who were often illiterate, impoverished, and lacked property ownership due to the legacy of slavery and systemic racism.

However, realizing that these requirements may negatively impact poor and illiterate white voters as well, some Southern states introduced the grandfather clause as a way to exempt white voters from these requirements. The grandfather clause allowed individuals to vote if their ancestors had been eligible to vote prior to 1867 or before the passage of the Fifteenth Amendment, which granted voting rights to African American men in 1870.

By using this requirement, Southern states effectively allowed white voters to bypass the discriminatory practices intended to suppress Black voters. This mechanism allowed many white citizens to maintain their voting rights while disenfranchising African Americans and perpetuating racial discrimination in the American democratic process.